摘要
运用回剥分析技术对川鄂湘边区沉降史作了定量研究 .研究表明 :川鄂湘边区的沉降作用受构造作用、海平面变化及沉积负载控制 ,共经历了 4个快速沉降期、4个缓慢沉降期、2个隆升期和1个块断差异沉降期 .快速沉降期对应于构造的强烈活动和海平面的快速上升 ,缓慢沉降期对应于构造活动的减弱 ,而隆升期往往对应于挤压上升和海平面的快速下降 .震旦纪 -早古生代沉降作用明显受构造作用控制 ,晚古生代的低沉降幅度可能是同期海平面变化引起的 ,三叠 -侏罗纪的沉降作用受控于同期的构造活动 。
The subsidence history of the region is quantitatively studied by backstripping analysis technique. The result shows that the subsidence in the region is controlled by tectonic movement, the changes of sea level and sedimentary load. The region underwent four rapidly subsiding periods, four slowly subsiding periods, two uplifting periods and one block-faulted differential subsiding period. The rapidly subsiding periods are due to strong tectonic movement and the rapidly rising of sea level, the slowly subsiding periods are caused by weak tectonic movement, and the uplifting periods are always related to compressional uplift and rapidly desending of sea level. Subsidence in Sinian-early Palaeozoic is obviously controlled by tectonic activity. The lower subsidence magnitude in late Palaeozoic may be caused by the changes of seal level. Subsidence in Triassic-Jurassic period is controlled by the tectonic activity in the corresponding periods. At the same time, the changes of sea level also have effects on the subsidence of this period.
出处
《西安石油学院学报（自然科学版）》
2002年第4期10-15,共6页
Journal of Xi'an Petroleum Institute（Natural Science Edition)
关键词
川鄂湘边区
沉降史
定量分析
油气地质
回剥分析
海平面变化
负载
border region of Sichan-Hubei-Hunan
basin subsidence history
backstripping analysis
change of sea level
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